As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START ZONE TEMP LIGHT ILLUMINATED FOR "CONT CAB". GROUNDED YES. INSTALLED SERVICEABLE TRIM AIR MODULATING VALVE PERFORMED BITE CHECK ON BOTH ZONE TEMP. CONTROLLERS. NO FAULTS LOGGED. PRESSURIZED PNEUMATIC SYSTEM LEAK CK. NORMAL. REF. AMM 21 61 21.